Locking means for carriage bolts



Patented July 15, 1924.

FREDERICK H. THOMPSON, OFKCHICAGOyILLINOIS.

Fics.

LOCKING MEANS FOR CARRIAGE BOLTS.

Application filed April 12, 1922.4 SeralNoqvlS.

hereby declare that the! following is a full,V

clear yand exact description of the same7 reference being had to the accompanying drawings, and to the numerals of reference marked thereon, which forni a part of this specification.

A carriage bolt is provided with a squared portion close under the head which is intended to prevent rotation of the bolt in the wood while the nut is being turned to tighten the bolt.

When such a bolt is used in old wood or iii soft wood there is danger that the wood may yield so that the squared portion of the bolt will no longer hold the bolt from turning. This is particularly disadvantageous when the head of the bolt is in an inaccessible place, for example, underneath the upholstering.

It is an object of this invention to provide a means for preventing` the bolt from turnine.

t is a further Object of this invention tov provide an abundant anchorage between said means and the wood so that it shall eifectively prevent the bolt from turning even when used with very soft, or very old, or partly decayed wood.

lt is a further obj ect of this invention to provide suoli a fastening means which may be forced into the wood by the action of the bolt itself in being tightened.

It is a further object of this invention to provide a fastening means which is adapted for use with bolts of various sizes.

It is a further object of this invention to provide a reinforcing or fastening means which may be stamped out of sheet metal.

Other and further important objects of this invention will be apparent from the disclosures in the specification and the drawings. n

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

On the drawings:

Figure l is a top plan View of a piece of wood prepared for the reception of the bolt,

with. devices embodying this invention in place thereon.

Figure 2 isa section upon the line 2 2 of Figure l showing the bolt and fastening means before the bolt is tightened.

Figure 3 is a similar View showing the bolt tightened all the way home.

Y Figure 4 is a section upon the line 4-4 of Figure 3.'

s shown on theV drawings:

The wood 1 which is to receive the bolt has a circular hole 2 bored in it. The portion of the hole nearest the head of the bolt is enlarged into a square recess 4 slightly larger than the squared portion 5 of the shank of the bolt. A pair of W-sliaped pieces of sheet metal are placed with their edges against the wood. The middle angles of these pieces have longer sides than the outer ones and are right angles intended to fit one corner of the squared recess 47 as shown at 6. At each end of the sides' of the angle 6 the sheet metal is turned outward, as shown at 7. The turned-out portions 7 eX- teiid beyond the edges of the square hole 4 so that the sheet metal pieces are maintained by the wood above the hole as shown at 8 in Figure 2.

The bolt is then passed through the round hole, and its squared portion 5 fits the square corners 6 so that the head 9 of the bolt rests against the upper edge of the sheet metal casing. A nut 10 is screwed on to, the threaded end of the bolt and contacts with the piece 11 which is to-be fastened to the wood 1. As the nut l() is further tightened the head 9 is thrust against the edges of the pieces 8 and forces the outstanding parts 7 into the wood. As these pieces travel, the sides of the angles 6 enter the corners of the hole 4 until the head 9 contacts with the surface of the wood l, at which time the lower edges of the sheet metal members Will contact with the floor of the square hole 4, as shown at 12 in Figure 3.

The outstanding parts 7 thoroughly anchor the sheet. metal members in the wood. The contact of the sides o-f the angle 6 with the sides of the hole also preventsmotion of these members. The sides of the squared portion 5 of the bolt contacting with the interior sides of the angles 6 prevent the bolt from turning. Rotation of the nut 10 therefore cannot cause the bolt to. rotate and therefore the nut will always tighten the bolt andthe bolt will not rotate with the nut so that the turning of the nut is never idle.

l/Vhen the bolt is first put into place the head 9 is available to the workman and he may start the outlying members 7 into the wood by striking the head 9 of the bolt with a hammer. He may, it' desired, even drive the bolt all the way home to the position shown in Figure 3 by pounding onthe head 9V with a hammer; but after the head 9 has been covered with upholstery or after any other arrangement that. makes it inaccessible, if the bolty becomes loose itis necessary to rely upon the turning of the nut 10 to tighten it. The Ysheet metal members being firmly gripped in the wood are capable of preventing the bolt from turning, so` that turning the nut l() may always be relied upon fork this purpose. Whenever the bolt works loose, therefore, either from vibration or other cause, it may always kbe tightened again by turning the nut l0.

lilith larger or smaller bolts, the ends 7 will be farther apart or nearer together so that 'the square hole is more nearly lined with metal in the case of a smaller bolt.

- The variation in the gap between adjacent ends 7 is suliicient to care for diderent sizes not necessary to make special sizes of the sheet metal members.

I am awa-re that many details in the construction may be varied through a wide range without departing from the spirit of this invention, and I therefore do not wish to limit the patent granted otherwise than necessitated by the prior art.

I claim as my invention:

l. In combination, a body ot wood having 'a hole therethrougln said hole having a squaredl recess at one surface of the wooden body, angular metal members lining said recess, and acarriage bolt, the squared portion of which contacts with said angular metal members.

2. In combination with a carriage bolt,

W-shaped pieces ot sheet metal having` their central angles fitted to the squared part of the carriage bolt, and the outer legs oi' the W penetrating the woodv into which the carriage bolt is inserted.

In testimony whereof I have hereunto subscribed my name in the presence of two subscribing witnesses.

FREDERICK H. THOMPSON.

1Witnesses CARLTON HILL, JAMES M. OBRIEN. 

